基于广义S变换的声发射信号去噪研究

摘要

为了有效消除声发射信号中的噪声,将广义S变换滤波方法应用于声发射信号去噪,分别采用广义S变换中的充零法、基于带通滤波器设计滤波算子法以及时频滤波法进行滤波比较,针对信号的不同时频特性设计了相应的时频滤波算子.结果表明,基于S变换的三种时频滤波法对声发射信号的去噪均有较好的效果,克服了传统滤波方法滤波因子不能随时间、频率变化而变化的缺陷.其中时频滤波法在高信噪比和低信噪比情况下都能更好地去除噪声,可以满足信号处理的要求.%Based on generalized S transform (GST) zero-filling,design operator using band-pass filter and time-frequency fil-tering were applied to AE signals denoising. It designed the corresponding time-frequency filtering operators for the different frequency characteristics of signals. Experimental results show that the time-frequency filtering based on GST has obvious ad-vantages. It can effectively remove the noises in the case of both the high signal to noise ratio(SNR)and the low SNR.